diff --git a/.github/workflows/rust-ci.yml b/.github/workflows/rust-ci.yml
index b66125da3b..22a9291a5f 100644
--- a/.github/workflows/rust-ci.yml
+++ b/.github/workflows/rust-ci.yml
@@ -103,6 +103,8 @@ jobs:
 
           # Also run representative release builds on Mac and Linux because
           # there could be release-only build errors we want to catch.
+          # Hopefully this also pre-populates the build cache to speed up
+          # releases.
           - runner: macos-14
             target: aarch64-apple-darwin
             profile: release